178 BRITISH SEA- WEEDS. {Rliodosjiermece. 



Hab. In the sea_, on perpendicular faces of rocks, at half- 

 tide level. Perennial. Common on the rocky coasts of 

 England, and west and south of Ireland. I have not heard 

 that it has ever been got in Scotland. 



It is a large, rigid, shaggy plant, of a dull brownish-red 

 colour. It is one of the coarsest of this family. 



7. Callithamniox roseum, Lynghije. (Plate YII. fig. 26, 

 a branch, natural size ; to the right a branchlet with tetra- 

 spores, magnified.) 



Hab. On mud-covered rocks, and on Algae. Annual. 

 Summer. Yarmouth, Messrs. Turner and Borrer ; Torquay, 

 Mrs. Griffiths; Bantry Bay, Miss Hutchins; County Clare, 

 Dr. Mackay. 



This, I think, is rare in Scotland. I found a little scrap 

 of it, which was named Callithamnion roseum for me by Sir 

 AYm. J. Hooker, when I was beginning to collect Algae, and 

 I have got no more of it since. It is a beautiful plant. 



8. Callithamnion FLOccosuM, yiya;Y/^. (Plate YI. fig. 22, 

 a portion of the frond, natui-al size ; under it, on the right, 

 a plumule with tetraspores, and on the left, a branchlet, both 

 magnified.) 



Hab. On submarine rocks, nCar low-water mark. Annual. 

 Spring. Yery rare. 



